[Coco] Proposed change on coVDG (level1)

[Cocodemus]

Do you mean the coco2b? It works on a 2b since the true lowercase are mapped into the reverse ones. This extra ldb there is moot.

 

Sent from my iPhone

> On Jan 30, 2015, at 3:21 PM, Robert Gault <robert.gault at att.net> wrote:
> 
> Luis Antoniosi (CoCoDemus) wrote:
>> But that is intended :). $60 is acute accent.
>> 
>> The old code replaced $60 to $67 (apostrophe). I think it should be $27
>> (reverse apostrophe) to make the distinction between apostrophe and acute
>> accent symbol. What do you think ? How do you know you typed apostrophe or
>> acute accent if they look the same ???
>> 
>> Luis Felipe Antoniosi
> 
> Louis,
> 
> I've had a change to look more closely at your proposed code. For one thing you ignore whether there is true lower case available.
> 
> ldb <V.CFlag,u
> cmpa #$40 numbers ?
> 
> The value in V.CFlag is ignored and that indicates true false lower case.
> 
> 
> Why not try transplanting the code from Level2 covdg if you think that is the main factor in screen writing speed?
> 
> Here is the equivalent section of code.
> 
>         tsta
>         bmi   L01BA
>         ldb   <VD.CFlag,u
>         beq   L019A
>         cmpa  #$5E
>         bne   L018A          re-map characters from ASCII-VDG
>         clra
>         bra   L01BA
> L018A    cmpa  #$5F
>         bne   L0192
>         lda   #$1F
>         bra   L01BA
> L0192    cmpa  #$60
>         bne   L01AA
>         lda   #$67
>         bra   L01BA
> 
> L019A    cmpa  #$7C          true lowercase
>         bne   L01A2
>         lda   #$21
>         bra   L01BA
> L01A2    cmpa  #$7E
>         bne   L01AA
>         lda   #$2D
>         bra   L01BA
> L01AA    cmpa  #$60
>         bcs   L01B2          re-map ASCII
>         suba  #$60
>         bra   L01BA
> L01B2    cmpa  #$40
>         bcs   L01B8
>         suba  #$40
> L01B8    eora  #$40
> 
> CFlag is used to provide different routines for true/false lowercase.
> 
> Robert
> 
> 
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